Electric-wave-form tracer.



. WITNEssIEs; 'q

. 1L J`. RYAN.

ELECTRIC WAVE FORM TRAGER. APPLICATION FILED JULY 3, 1905.

44 III INVENTOR;

an instrument of held 'in-a U-shaped cradle f,

` connected by suitable con UITED STATES. PATENT OFFICE.

niiRis J. RYAN', oFiTHAcA, NEW YORK. i 'I ELEcTR|C-wAv-i=onm TRACER."

Specicatfion; of Letters Patent. ippumiameaiuiy s, isos. serial No.263,087.

Patented Nov. 6, 1906.

To a/ZZ whom it may concern: l

. Be it known thatI, HARRIS J RYAN, a, citizenof the United States,residinglin Ithaca, in the county of Tompkins and State of New York,have invented certain new and useful ImprovementsV invElectric-Viave-Form Tracers, of which the following is a description,reference being had to the'accompan ying drawings.

Thisjnvention relates to improvements in' devices which visually tracethe variations in direction and intensity of an electric current; andthe objectoflmy invention isto rovide this class which s all be simplein construction, accurate 'in its results, and practical upon acommercial scale.

. -In the drawings, Figure 1 is' a top plan view of my new wave-formtracer. Fig. 2 is a central longitudinal sectional view on line B B. ofFig. 1, and Figsf3 and 4 showdetails hereinafter referred-to. A

a is a tube from which theair is exhausted so`a`s to roduce a vacuum ofhigh degree and in whic`I are mounted two lates b and c. This tube isformed at one en in which is mounted a screen e and whichis mounted uponthe base-board g, lof`woodvor other suitable h, of hard rubber or othersuitable insulating material.

Between the screen e and the plates b and c is mounted 'in the tubea thediaphragm ln., pierced to vallow the passage of the pencil of raysgenerated when lthefplates b and c are a Holtz machine.. Hence theplates b and c resemble the plates of an ordm Crookes tube, andhereinafter the late b be called the anode and plate c t e cathode Thepencil of rays has been found to be in- {iuenced by a magnetic ield,being deected thereby., The amount ofthe deflection de# sel-nds upon theintensity of the iield, and the ection of the dee'ction depends' uponthe direction of the current roducing the iield.

7c 7c are two solenoids orming a air and set on opposite sides of thetube a, w e m lm'I are two other solenoids Seton opposite sides of thetube a'upon a `diameter at right angles to the diameter assing throughthe centers of the solenoidsl Jc. (See Fig. 3.) Current is led throughthe -solenoids m lm from the mains l l, which carry the current whosewave-form is to be determined, and current from the same mains is ledthrough suitable reactances and condensers forming a with than) d,

This base-board g rests upon legsuctors i andy` with vand means forgenerating 'a therein, a screen which intercepts said beam circuitproperly arranged tc damp out the upper harmonics, and thence throughthe solenoids k k. The object of damping out the `upper harmonics is toproduce a true sine-wave current through A the solenoids k k. As shownthe drawings, thearrangementfor damping out the upper harmonics of theunknown current, so as to obtain a current of sine-wave form consistsofa divided circuit, in' one inductivev resistance u and in the other artof which is the condenser t, which divide c' cuit is connected with thesolenoids k 7c through the inductive resistance s; but current from asource of known wave-form may be led thereto.

The pencil of rays pas 'phmgm rents ilowing through lthe sets ofsolenoids m m and 7c 7c, so that the spot of light u on the screen ewill trace a curve which wi be the resultant of the curves dueto thecurrents separately. Now since the resultant curve is known and one ofits components is known to be a sine curve its othei component isreadily determined. Persistence of vision enables the operator to tracewith a pencil upon a piece of sectionpaper the curve traced by therapidly-movmg spot of light,

ing throughI the diamanent record of the curve traced. In ig.

4 I have illustrated one of thesecurves.

What I claim is 1. In combination with a vacuum-tube and means forproducing a encil of rays or photography may be used to obtaina 'er.

therein, a fixed screen which intercepts said -pencil of rays,

thereby causing a y spot to appear upon said screen, and electromagneticmeans for moving said pencil of rays to Lcause said spot of light totrace a curve upon said screen.

part of which is the fn. will be deflected by the two curluminous l 2.In combination withl -a vacuum-tube beam oflight a magnetic device.energized by the current under examination; and a magnetic deviceenergized by a currentwhose wave-form is known.

. 3. In combination with a vacuum-tube IOO and means for generating avpenc'l of rays therein, ascreen which intercepts saidpencil, -therebyproducinga spot of light upon said screen; a suitable source ofelectricity; an 4electromagnetic device connected therewith; asecondelectromagnetic device placed at an angle to the iiist-named electromag-IIO netic device; and means for damping out the upper harmonics from acurrent of varying intensity, said means connecting said source and saidsecond electromagnetic device.

4. In combination with a vacuum-tube and means for generating a pencilof rays therein, a screen which intercepts said pencil of rays, therebycausing a luminous spot to appear upon said screen; and electromagneticmeans for causing said spot to trace a curve upon said screen.

5. The combination of a vacuum-tube; lneans for generating a pencil ofrays therein; a screen which intercepts said pencil of rays, therebycausing a luminousspot to a peal` upon said screen; a suitable source ocurrent; a pair of solenoids connected with said source, one of saidsolenoids being upon .one side of said tube and the other solenoid beingupon the opposite side lof said lenoids being connected in series witheach other; asecond pair of solenoids, one of which is disposed abovesaid tube and the other of which is disposed below said tube; andelectrical devices for dam ing out the upper harmonies of a currentofpvarying intensity, said devices connecting said second pair ofsolenoids with said source.

HARRIS J. RYAN.

Witnesses:

DORA A. HILDEBRANT, CHAs. D. BosTWrcK.

2O tube, said so-

